For a contribution of any amount, you may install the add-on on a commercial site, and no additional add-ons are required to be installed. You can even use CSS or Javascript to hide the copyright notice.

Alternatively, by purchasing a subscription at waindigo.org and installing the Install and Upgrade by Waindigo add-on, you can also completely remove all branding and activate any premium features on all your add-ons. You can also remove all branding and get the premium features for this add-on if you make a significant contribution to this add-on in any way.